Using grep
grep is the most common and versatile tool for searching text in Linux. Here’s how to use grep for your task:
Basic search
grep "keyword" filename.txt – This searches for the keyword “keyword” in the file “filename.txt” and displays lines containing the keyword.
Search all files in a directory recursively
grep -r "keyword" directory/ – This searches for “keyword” in all files inside the directory “directory/” and its subdirectories.
Additional options
-i: Ignore case (make search case-insensitive)-w: Search for whole words only (not parts of words)-n: Print line numbers where the keyword is found-l: List only the filenames containing the keyword (without showing the content)